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Unified Diff: include/core/SkBitmap.h

Issue 388803007: Add SkBitmap::readPixels() and reimplement copyTo and SkCanvas::readPixels (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 6 years, 5 months ago
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Index: include/core/SkBitmap.h
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 51e9a9243a13b156ab8591d888b79bbbd11588e6..541db79bb3741a9e3dcdc3ba22dbe2089d6e8096 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -591,6 +591,28 @@ public:
}
/**
+ * Copy the bitmap's pixels into the specified buffer (pixels + rowBytes),
+ * converting them into the requested format (SkImageInfo). The src pixels are read
+ * starting at the specified (srcX,srcY) offset, relative to the top-left corner.
+ *
+ * The specified ImageInfo and (srcX,srcY) offset specifies a source rectangle
+ *
+ * srcR.setXYWH(srcX, srcY, dstInfo.width(), dstInfo.height());
+ *
+ * srcR is intersected with the bounds of the bitmap. If this intersection is not empty,
+ * then we have two sets of pixels (of equal size). Replace the dst pixels with the
+ * corresponding src pixels, performing any colortype/alphatype transformations needed
+ * (in the case where the src and dst have different colortypes or alphatypes).
+ *
+ * This call can fail, returning false, for several reasons:
+ * - If srcR does not intersect the bitmap bounds.
+ * - If the requested colortype/alphatype cannot be converted from the src's types.
+ * - If the src pixels are not available.
+ */
+ bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
+ int srcX, int srcY) const;
+
+ /**
* Returns true if this bitmap's pixels can be converted into the requested
* colorType, such that copyTo() could succeed.
*/
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